Are native nectar robbers against the alien? Effects of floral larceny on the reproductive success of the invasive yellow bells (Tecoma stans, Bignoniaceae)

Santos, Jean Miguel Alves dos; Carneiro, Liedson Tavares; Martins, Celso Feitosa

doi:10.1016/j.actao.2020.103547

Cited by 9 publications

(7 citation statements)

References 37 publications

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“…In contrast to findings we present here, many studies suggest robbing can have limited or no negative effects on the female component of fitness (Andalo et al., 2019 ; Carrió & Güemes, 2019 ; Maloof, 2001 ; Richardson, 2004 ; dos Santos et al., 2020 ; Varma et al., 2020 ; Varma & Sinu, 2019 ; Zimmerman & Cook, 1985 ). This lack of an effect on reproductive output could be due to the legitimate pollinators still visiting the plant and saturating the stigmas with enough pollen so the plant can achieve full seed set (Heiling et al., 2018 ; Stout et al., 2000 ).…”

Section: Discussioncontrasting

confidence: 99%

Novel nectar robbing negatively affects reproduction in Digitalis purpurea

Mackin

Goulson

Castellanos

2021

Ecology and Evolution

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Many plant-pollinator interactions are undergoing change due to multiple anthropogenic influences (González-Varo et al., 2013;Goulson et al., 2015). At present, we have a limited understanding of how novel interactions affect plant reproductive success, for example, after plant invasion (Barrett et al., 2008;Chalcoff et al., 2019;Richardson et al., 2000). One interaction with consequences for plants is nectar robbing, where plants have their mutualism with pollinators bypassed by floral visitors (robbers) that consume nectar rewards without pollinating (Irwin et al., 2010). In the same way as pollination mutualisms, this interaction between

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Section: Discussioncontrasting

confidence: 99%

Novel nectar robbing negatively affects reproduction in Digitalis purpurea

Mackin

Goulson

Castellanos

2021

Ecology and Evolution

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“…In contrast to findings we present here, many studies suggest robbing can have limited or no negative effects on the female component of fitness (Andalo et al, 2019;Carrió & Güemes, 2019;Maloof, 2001;Richardson, 2004;dos Santos et al, 2020;Varma et al, 2020;Varma & Sinu, 2019;Zimmerman & Cook, 1985). This lack of an effect on reproductive output could be due to the legitimate pollinators still visiting the plant and saturating the stigmas with enough pollen so the plant can achieve full seed set (Heiling et al, 2018;Stout et al, 2000).…”

Section: Discussioncontrasting

confidence: 99%

Novel nectar robbing negatively affects reproduction in Digitalis purpurea

Mackin

Goulson

Castellanos

2021

Preprint

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With many plant-pollinator interactions undergoing change, we require a better understanding of how the addition of new interacting partners, such as antagonists, can affect plant reproduction. One such group of antagonistic floral visitors, nectar robbers, can deplete plants of nectar rewards without contributing to pollination. The addition of nectar robbing to the floral visitor assemblage could therefore have costs to the plant´s reproductive output. We focus on a recent plant colonist, Digitalis purpurea, a plant that in its native range is rarely robbed, but experiences intense nectar robbing in areas it has been introduced to. Here, we test the costs to reproduction following experimental nectar robbing. To identify any changes in the behaviour of the principal pollinators in response to nectar robbing, we measured visitation rates, visit duration, proportion of flowers visited and rate of rejection of inflorescences. To find the effects of robbing on fitness, we used proxies for female and male components of reproductive output, by measuring the seeds produced per fruit and the pollen export respectively. Nectar robbing significantly reduced the rate of visitation and lengths of visits by bumblebees. Additionally, bumblebees visited a lower proportion of flowers on an inflorescence that had robbed flowers. We found that flowers in the robbed treatment produced significantly fewer seeds per fruit on average but did not export fewer pollen grains. Our finding that robbing leads to reduced seed production could be due to fewer and shorter visits to flowers leading to less effective pollination. We discuss the potential consequences of new pollinator environments, such as exposure to nectar robbing, for plant reproduction.

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“…Invasive species growing on coastal dunes 9 [5,25]; see Table 3 Mexican native species invading coastal dunes abroad 30 [5]; see Tecoma stans (L.) Juss. ex Kunth Bignoniaceae Africa/Asia/South America Shrub [46] The flow of exotic plants from and towards Mexico is broad and includes all continents (Figure 2). Mexican native plants considered invasives abroad have reached all regions, except for the Mediterranean.…”

Section: Resultsmentioning

confidence: 99%

Mexican Coastal Dunes: Recipients and Donors of Alien Flora

et al. 2021

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The invasion of natural communities by exotic plants, which may turn into invasive or potentially invasive, is one of the most severe known threats to biodiversity, and coastal dunes are among the most affected habitats. Mexico’s coastal dunes are abundant and contain high plant biodiversity but attempts to determine the occurrence and impact of exotic plants are absent. First, we explored the number of invasive plant species found on Mexican coastal dunes. Second, we analyzed if the coastal dune flora native from Mexico acts as a source of invasive species worldwide. We found the relevant spread of exotic plants towards and from Mexico, reaching high percentages: 5% of the coastal dune flora are considered exotic plants; this increases to 8.7% when only plants typical of the coastal dune environment are considered. The Mexican coastal dunes flora is also a relevant source of invasive plants affecting all continents. Furthermore, almost half of the 35 worst worldwide invasive plants (according to the Global Invasive Species Database GISD) grow on Mexican coastal dunes, most native to Mexico and invasive elsewhere. Indeed, the worldwide exchange of coastal dune flora between Mexico and the world seems massive, relevant and highlights the need for worldwide and countrywide management and control strategies.

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Are native nectar robbers against the alien? Effects of floral larceny on the reproductive success of the invasive yellow bells (Tecoma stans, Bignoniaceae)

Cited by 9 publications

References 37 publications

Novel nectar robbing negatively affects reproduction in Digitalis purpurea

Novel nectar robbing negatively affects reproduction in Digitalis purpurea

Novel nectar robbing negatively affects reproduction in Digitalis purpurea

Mexican Coastal Dunes: Recipients and Donors of Alien Flora

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